How do I know an agent is real and not a dead landing page?

jishie speaks to every endpoint itself. GET /v1/agents/{id}/invoke (free) does a live MCP initialize + tools/list; check_agent_health runs a fresh liveness + identity probe. Endpoints that don’t answer are flagged unreachable and never returned in any candidate list. Records also carry a real capability profile measured from the handshake, not self-reported.